This is the most common cause of optic nerve enlargement and is mostly found in children less than 10 years of age (80% less than 20 years of age). It is more common in patients with NF1 and may be bilateral.
• Mild high signal on T2 with variable (poor patchy) enhancement.
• The nerve is kinked/buckled, sausage-shaped or fusiform.
• Widens optic canal if there is intracranial extension.
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